/**
 * @license Copyright (c) 2003-2023, CKSource Holding sp. z o.o. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */
/**
 * @module image/image/imageinlineediting
 */
import { Plugin } from 'ckeditor5/src/core';
import { ClipboardPipeline } from 'ckeditor5/src/clipboard';
import { UpcastWriter } from 'ckeditor5/src/engine';
import { downcastImageAttribute, downcastSrcsetAttribute } from './converters';
import ImageEditing from './imageediting';
import ImageSizeAttributes from '../imagesizeattributes';
import ImageTypeCommand from './imagetypecommand';
import ImageUtils from '../imageutils';
import { getImgViewElementMatcher, createInlineImageViewElement, determineImageTypeForInsertionAtSelection } from '../image/utils';
/**
 * The image inline plugin.
 *
 * It registers:
 *
 * * `<imageInline>` as an inline element in the document schema, and allows `alt`, `src` and `srcset` attributes.
 * * converters for editing and data pipelines.
 * * {@link module:image/image/imagetypecommand~ImageTypeCommand `'imageTypeInline'`} command that converts block images into
 * inline images.
 */
export default class ImageInlineEditing extends Plugin {
    /**
     * @inheritDoc
     */
    static get requires() {
        return [ImageEditing, ImageSizeAttributes, ImageUtils, ClipboardPipeline];
    }
    /**
     * @inheritDoc
     */
    static get pluginName() {
        return 'ImageInlineEditing';
    }
    /**
     * @inheritDoc
     */
    init() {
        const editor = this.editor;
        const schema = editor.model.schema;
        // Converters 'alt' and 'srcset' are added in 'ImageEditing' plugin.
        schema.register('imageInline', {
            inheritAllFrom: '$inlineObject',
            allowAttributes: ['alt', 'src', 'srcset']
        });
        // Disallow inline images in captions (for now). This is the best spot to do that because
        // independent packages can introduce captions (ImageCaption, TableCaption, etc.) so better this
        // be future-proof.
        schema.addChildCheck((context, childDefinition) => {
            if (context.endsWith('caption') && childDefinition.name === 'imageInline') {
                return false;
            }
        });
        this._setupConversion();
        if (editor.plugins.has('ImageBlockEditing')) {
            editor.commands.add('imageTypeInline', new ImageTypeCommand(this.editor, 'imageInline'));
            this._setupClipboardIntegration();
        }
    }
    /**
     * Configures conversion pipelines to support upcasting and downcasting
     * inline images (inline image widgets) and their attributes.
     */
    _setupConversion() {
        const editor = this.editor;
        const t = editor.t;
        const conversion = editor.conversion;
        const imageUtils = editor.plugins.get('ImageUtils');
        conversion.for('dataDowncast')
            .elementToElement({
            model: 'imageInline',
            view: (modelElement, { writer }) => writer.createEmptyElement('img')
        });
        conversion.for('editingDowncast')
            .elementToStructure({
            model: 'imageInline',
            view: (modelElement, { writer }) => imageUtils.toImageWidget(createInlineImageViewElement(writer), writer, t('image widget'))
        });
        conversion.for('downcast')
            .add(downcastImageAttribute(imageUtils, 'imageInline', 'src'))
            .add(downcastImageAttribute(imageUtils, 'imageInline', 'alt'))
            .add(downcastSrcsetAttribute(imageUtils, 'imageInline'));
        // More image related upcasts are in 'ImageEditing' plugin.
        conversion.for('upcast')
            .elementToElement({
            view: getImgViewElementMatcher(editor, 'imageInline'),
            model: (viewImage, { writer }) => writer.createElement('imageInline', viewImage.hasAttribute('src') ? { src: viewImage.getAttribute('src') } : undefined)
        });
    }
    /**
     * Integrates the plugin with the clipboard pipeline.
     *
     * Idea is that the feature should recognize the user's intent when an **block** image is
     * pasted or dropped. If such an image is pasted/dropped into a non-empty block
     * (e.g. a paragraph with some text) it gets converted into an inline image on the fly.
     *
     * We assume this is the user's intent if they decided to put their image there.
     *
     * **Note**: If a block image has a caption, it will not be converted to an inline image
     * to avoid the confusion. Captions are added on purpose and they should never be lost
     * in the clipboard pipeline.
     *
     * See the `ImageBlockEditing` for the similar integration that works in the opposite direction.
     *
     * The feature also sets image `width` and `height` attributes when pasting.
     */
    _setupClipboardIntegration() {
        const editor = this.editor;
        const model = editor.model;
        const editingView = editor.editing.view;
        const imageUtils = editor.plugins.get('ImageUtils');
        const clipboardPipeline = editor.plugins.get('ClipboardPipeline');
        this.listenTo(clipboardPipeline, 'inputTransformation', (evt, data) => {
            const docFragmentChildren = Array.from(data.content.getChildren());
            let modelRange;
            // Make sure only <figure class="image"></figure> elements are dropped or pasted. Otherwise, if there some other HTML
            // mixed up, this should be handled as a regular paste.
            if (!docFragmentChildren.every(imageUtils.isBlockImageView)) {
                return;
            }
            // When drag and dropping, data.targetRanges specifies where to drop because
            // this is usually a different place than the current model selection (the user
            // uses a drop marker to specify the drop location).
            if (data.targetRanges) {
                modelRange = editor.editing.mapper.toModelRange(data.targetRanges[0]);
            }
            // Pasting, however, always occurs at the current model selection.
            else {
                modelRange = model.document.selection.getFirstRange();
            }
            const selection = model.createSelection(modelRange);
            // Convert block images into inline images only when pasting or dropping into non-empty blocks
            // and when the block is not an object (e.g. pasting to replace another widget).
            if (determineImageTypeForInsertionAtSelection(model.schema, selection) === 'imageInline') {
                const writer = new UpcastWriter(editingView.document);
                // Unwrap <figure class="image"><img .../></figure> -> <img ... />
                // but <figure class="image"><img .../><figcaption>...</figcaption></figure> -> stays the same
                const inlineViewImages = docFragmentChildren.map(blockViewImage => {
                    // If there's just one child, it can be either <img /> or <a><img></a>.
                    // If there are other children than <img>, this means that the block image
                    // has a caption or some other features and this kind of image should be
                    // pasted/dropped without modifications.
                    if (blockViewImage.childCount === 1) {
                        // Pass the attributes which are present only in the <figure> to the <img>
                        // (e.g. the style="width:10%" attribute applied by the ImageResize plugin).
                        Array.from(blockViewImage.getAttributes())
                            .forEach(attribute => writer.setAttribute(...attribute, imageUtils.findViewImgElement(blockViewImage)));
                        return blockViewImage.getChild(0);
                    }
                    else {
                        return blockViewImage;
                    }
                });
                data.content = writer.createDocumentFragment(inlineViewImages);
            }
        });
        this.listenTo(clipboardPipeline, 'contentInsertion', (evt, data) => {
            if (data.method !== 'paste') {
                return;
            }
            model.change(writer => {
                const range = writer.createRangeIn(data.content);
                for (const item of range.getItems()) {
                    if (item.is('element', 'imageInline')) {
                        imageUtils.setImageNaturalSizeAttributes(item);
                    }
                }
            });
        });
    }
}
